Multiple choice

A liter of pure alcohol is added to 6 litres of 30% alcohol solution. The percentage of water in the solution-

  1. 50%

  2. 65%

  3. 60%

  4. 40%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

6 litres of 30% alcohol contains 1.8L alcohol + 4.2L water. Adding 1L pure alcohol gives 2.8L alcohol + 4.2L water = 7L total. Percentage of water = (4.2/7) × 100 = 60%. Option C is correct. Options A (50%), B (65%), and D (40%) are incorrect.

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